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J. W. EASTON.

TENSION DEVIGE FOR WINDING ELEGTRO MAGNETS. No. 375,697. Patented Dec. 27-, 1887.

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spending pulley, b upon a reel, A, which car- UNITED STATES PATENT ()FFICE.

JAMES WV. EASTON, OF NEW YORK, N. Y.

TENSION DEVICE FOR WIN DING ELECTRO-MAGNETS.

SPECIFICATION forming part of Letters Patent No. 375,697, dated December27, 1887.

Application filedhiarch 16, 1887.

To (ZZZ 2071 9722 it may concern:

Be it known that I, JAMES W. EASTON, a snhj ect of the Queen of Great Britain, residing in New York, in the county and State of New York, have invented certain new and useful Improvements in Tension Devices for \Vinding Magnets, ofwhich the following is a specification.

The invention relates to the construction of devices for maintaining the required tension upon the wire while it is being wound upon the cores of electro-magnets.

The object of the invention is to provide a device which may be employed in connection with the insulated wire used in winding electro-magnets without injury to the insulation, and which serves also to take up the slack wire at any'time.-

The invention will be described in connection with the accompanying drawing, which illustrates the application of the invention to the winding of a magnet-coil for electric ma chines.

Referring to the drawing, M represents an electric motor of any suitable construction. The armaturem of the motoris constructed to revolve, or tends to revolve, in the direction indicated by the arrow. The contact-brushes m m are carried upon an adjustable support, S, by the turning of which the pull of the armature may be regulated. The adjustment of the position of the brushes is accomplished in a manner which will presently be described.

A suitable pulley, b, upon the shaft of the motor is coupled by a belt, E, with a cone ries the wire which is to be wound. The reel is supported upon an axis, T, resting in suitable bearings, F. The wire to is carried from the reel to the core of an electromagnet, as shown at O. This core is mounted in any suitable manner in temporary hearings or in a lathe, and may be turned by hand or in any other suitable manner. The motor tends to turn the reel in the proper direction to wind the wire upon the reel; but the revolution of the core overcomes this tendency and causes the armature to be revolved backward. The pull of the armature, however, takes up any slack in the wire occasioned by the stopping of the core 0 of the magnet or in any other manner, for the armature of the motor will immediately revolve the reel and wind the wire upon it. In case it is desired to unwind the wire from the coil more or less, the reel will be revolved in the proper direction to wind it up.

For the purpose of modifying the pull of the motor upon the reel, the position ofthe brushes m m may be adjusted. This is accomplished by means of a cord or other flexible connection, 0, passing oversuitablepulleys or guides, P P and connected at its end to a lever, L, at a point, 9-. The lever is pivoted at apoint,

p, and it is of sufficient weight to overbalance the weight E, which is carried by the support S of the brushes. The free end of the lever L is provided with a roller, R, or it may be simply padded to prevent injury to the covering of the wire. The end of the lever rests against the wire which is wound upon the core in the same line as the point where the wire strikes the core in winding. The core 0 is shown as being of oblong cross section, and as it turns on its axis the end of the lever L falls downward, and thereby raises the end E of the support for the brushes. This causes the brushes to be placed in such position as to increase the pull of the motor, and thus compensate for the less amount of wire which for the moment is being drawn from the reel. As the lever is raised the brushes move in'the opposite direc tion. \Vhen the core 0 is of circular crosssection, the lever L may be dispensed with and the brushes adjusted manually. In some instances, where the cores are of irregular shape, the automatic adjustment is not required. The precise method of coupling the motor to the reel is not always necessary, many other plans of so doing being evident.

It will be evident that one great advantage of this form of device is, that the covering of the wire is not injured by being passed through mechanical tension devices which rub against the covering of the wire, and also the slack wire is automatically taken up.

I claim as my invention- 1. The combination, with a reel of wire and devices for unwinding the same, of an electric motor connected with the reel and tending to revolve the same in the direction required to wind the wire upon itself.

2. The combination, with a reel for containing insulated wire, of an electric motor connected therewith tending to revolve it in a given direction, and means for winding the same upon acore andat the same time revolving the reel against the pull of the motor.

3. The combination, with a reel of insulated wire and a core upon which the wire is being wound, of an electric motor acting upon the reel in opposition to the pull of the core, and means for adjusting the pull of the motor.

4. The combination, with the core of an electro-magnet of irregular cross section and a reel of wire from which the wire is being wound upon the core, of a lover resting upon the core or upon the wire wound thereon, an 7 electric motor connected with the reel and tending to revolve it in the direction to wind the wire upon itself, an adjustable support for the brushes of the motor, and a connection between the said lever and said support.

In testimony whereof I have hereunto subscribed my name this Sth day of March, A. D. 1887.

JAMES NV. EASTON.

\Vitnesses:

DANL. W. EDGEOOMB, CHARLES A. TERRY. 

